If you define it without static type checking, it is fine to use the square brackets. It is possibly a bug to give those errors when type checking is in play.
FYI, there have been previous discussions about supporting the curly brace syntax too. Eric has an issue here: https://issues.apache.org/jira/browse/GROOVY-11492 Daniel did a partial PR here: https://github.com/apache/groovy/pull/691 Cheers, Paul. On Tue, Apr 15, 2025 at 7:22 PM Saravanan Palanichamy <chava...@gmail.com> wrote: > > Hello Groovy users > > What is the right way to define this java annotation in groovy? I am testing > this out in Groovy 5.0, I have not tried 4.x. > > I tried using [] after the default keyword, but I get the error > > "Cannot return value of type java.util.ArrayList<#E> for method returning > java.lang.Class<?>[]" and > "Cannot return value of type java.util.ArrayList<#E> for method returning > java.lang.Class<? extends MyClazz>[]" > > @Target({ ElementType.METHOD }) > @Retention(RetentionPolicy.RUNTIME) > public @interface MyAnnotation { > > Class<?>[] groups() default {}; > > Class<? extends MyClazz>[] payloads() default {}; > > } > > > regards > Saravanan
